@LEN0272 If they are on the same hardware version, I think this can be fixed with the firmware update. Simply they have different firmware when they're out from the factory....

@Chris_castongua If you look for the beta, contact the support team to check if there is any. I don't have any ideas about firmware.

@Ben-91 OK. Just simply put the IP address of the first NAT and you can go in without a problem. This is the fact. This should work the same to the VPN. 'cause VPN client gets an IP from the LAN...

@MakisFil So, there isn't a definite answer. Sometimes, lowering your Tx power can reduce the interference. Increasing the power indeed can boost the signal further. But, the environment can also...

@Chris_castongua Keep an eye on their firmware update. Not only you, we all give suggestion over this. Hope tp-link can update soon.

@LAMAGuru This is something we brought up to TP-LINK frequently. Glad they add OpenVPN to standalone. Hope this can be added soon.